my aspx page
<asp:ListBox ID="lstReportType" runat="server" Height="200px" SelectionMode="Multiple">
<asp:ListItem Text="ALL" Value="0"></asp:ListItem>
<asp:ListItem Text="TotalPaid" Value="1"></asp:ListItem>
<asp:ListItem Text="Balance" Value="2"></asp:ListItem>
</asp:ListBox>
<asp:Button ID="btnSubmit" runat="server" Text="Search" onclick="btnSubmit_Click" />
<asp:GridView ID="gvStudentDetails" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="StudentName" HeaderT ...
Go to the complete details ...